feat(nimble): Added API to get resolve ADV data

nimble/host/include/host/ble_esp_gap.h

@@ -121,6 +121,19 @@ int ble_gap_host_check_status(void);
 */
 int ble_gap_get_local_used_addr(ble_addr_t *addr);
 
+/**
+ * This API is called to get ADV data for a specific type.
+
+ *
+ * @param adv_data                  Pointer of ADV data which to be resolved.
+ * @param adv_type                  Finding ADV data type.
+ * @param adv_data_len              Total length of Advertising data.
+ * @param length                    Return the length of ADV data not including type.
+ *
+ * @return                          Pointer of type specific ADV data.
+ */
+uint8_t* ble_resolve_adv_data(const uint8_t *adv_data, uint8_t adv_type, uint8_t adv_data_len , uint8_t * length);
+
 #if MYNEWT_VAL(BLE_HCI_VS)
 #if MYNEWT_VAL(BLE_POWER_CONTROL)
 

nimble/host/src/ble_gap.c

@@ -850,6 +850,23 @@ int ble_gap_get_local_used_addr(ble_addr_t *addr)
 
     return rc;
 }
+
+uint8_t* ble_resolve_adv_data(const uint8_t *adv_data, uint8_t adv_type, uint8_t adv_data_len , uint8_t * length)
+{
+    int rc = 0;
+    const struct ble_hs_adv_field *fields;
+    const uint8_t *data;
+
+    rc = ble_hs_adv_find_field(adv_type, adv_data, adv_data_len, &fields); /*Fill adv field*/
+
+    if (rc == 0) {
+        *length = fields->length -1 ; /* minus length of type*/
+        data  = fields->value;  /* Type specific adv data*/
+        return (uint8_t*)data;
+    }
+
+    return NULL;
+}
 /*****************************************************************************
  * $misc                                                                     *
  *****************************************************************************/